/*
 * Copyright 2015 John Ahlroos
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package fi.jasoft.dragdroplayouts.demo;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import com.vaadin.navigator.Navigator;
import com.vaadin.navigator.View;
import com.vaadin.navigator.ViewChangeListener.ViewChangeEvent;
import com.vaadin.ui.Component;
import com.vaadin.ui.CustomComponent;

public abstract class DemoView extends CustomComponent implements View {

  private final Navigator navigator;

  public DemoView(Navigator navigator) {
    this.navigator = navigator;
    setSizeFull();
    setCompositionRoot(getLayout());
  }

  @Override
  public void enter(ViewChangeEvent event) {}

  public String getSource() {
    String path = getClass().getCanonicalName().replaceAll("\\.", "/") + ".java";

    InputStream is = getClass().getClassLoader().getResourceAsStream(path);
    if (is == null) {
      return "No source code available.";
    }

    BufferedReader reader = new BufferedReader(new InputStreamReader(is));

    try {

      boolean inCodeBlock = false;

      StringBuilder codelines = new StringBuilder();
      String line = reader.readLine();
      while (line != null) {
        if (line.contains("// start-source")) {
            inCodeBlock = true;
        } else if (line.contains("// end-source")) {
            inCodeBlock = false;
        } else if (inCodeBlock) {
            codelines.append(line);
            codelines.append("\n");
        } 
        line = reader.readLine();
      }

      reader.close();

      String code = codelines.toString();

      return code;
    } catch (IOException e) {
      return "No source code available.";
    }
  }

  public abstract Component getLayout();

  public abstract String getCaption();

    public abstract String getName();

}
